Additions to the knowledge of the land snails of Sabah (Malaysia, Borneo), including 48 new species Author Vermeulen, Jaap J. Author Liew, Thor-Seng Author Schilthuizen, Menno text ZooKeys 2015 531 1 139 http://dx.doi.org/10.3897/zookeys.531.6097 journal article http://dx.doi.org/10.3897/zookeys.531.6097 1313-2970-531-1 C845838EC9124BD8AB4E07980F91959E C845838EC9124BD8AB4E07980F91959E Taxon classification Animalia Stylommatophora Camaenidae Amphidromus psephos Vermeulen, Liew & Schilthuizen sp. n. Figure 40 Holotype . Malaysia , Sabah , Interior Province , Pun Batu c. 30 km West of Sepulut ( RMNH.5003951 ). Examined material from Sabah. Interior Province. Pun Batu c. 30 km West of Sepulut (leg. J.J. Vermeulen, V 1311). Description. Shell sinistral, rather large, rather thin but rather solid, opaque, white, top whorls with or without some oblique, pale brownish-purple markings, spire high-conical with convex sides to approx. narrowly ovoid; apex narrowly rounded. Surface shiny. Whorls: top whorls convex, other whorls slightly convex, flat or slightly concave just below the suture; last whorl rounded at the periphery, slightly convex below the periphery. Protoconch whorls rounded, minutely punctate. Teleoconch: few growth lines at irregular intervals, locally slightly raised. Spiral sculpture: a faint, very fine, dense stration locally present. Aperture slightly obliquely elliptic, peristome distinctly reflected on the palatal, basal and columellar side. Umbilicus closed, or rimate, a narrow pore underneath the reflected columellar peristome. Dimensions: Height 24-25 mm; width 11-12 mm; number of whorls 5-5 1/2; height aperture 11.0-11.5 mm; width aperture 6.5-7.5 mm. Figure 40-41. 40 Amphidromus psephos sp. n. Frontal view, shell 24 mm high (Malaysia, Sabah, Interior Province, Pun Batu c. 30 km West of Sepulut, RMNH.5003951, holotype) 41 Trachia serpentinitica sp. n. 41A Frontal view, shell 11.5 mm high 41B Same shell, umbilical view (Malaysia, Sabah, Sandakan Province, Gunung Meliau, South flank, BOR/MOL 3201, holotype). Habitat in Sabah and distribution. Found in shrubby forest on limestone bedrock. Alt. c. 500 m. Sabah: Interor, Pun Batu only. Endemic to Sabah. Cross diagnosis. The small size, combined with the narrow spire uniquely identifies this species within in the genus Amphidromus . Etymology. The name refers to the size of the shell [psephos (Gr.) = pebble].